Hydro Calculator

HYDRO CALCULATOR The Hydro Calculator - Science and technology meet form and function! Simply add water into the fuel cells and you have a functioning 8-digit environmentally friendly calculator. Instructions included.Ages 3+ To See More Hydro Clock. To See More Fruit Clock.

HYDRO CALCULATOR The Hydro Calculator - Science and technology meet form and function! Simply add water into the fuel cells and you have a functioning 8-digit environmentally friendly calculator. Instructions included.Ages 3+ To See More Hydro Clock. To See More Fruit Clock.